Fluid machine
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United States of America Patent
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Feb 3, 2015
Issued Date -
N/A
app pub date -
Sep 9, 2011
filing date -
Sep 13, 2010
priority date (Note) -
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Abstract
A fluid machine of an embodiment includes a sealing portion formed of an annular minute gap between a runner band of a runner configuring a rotating portion and a sealing liner which is a stationary portion and arranged in opposition to the runner band. A groove having a quadrangular cross-sectional shape is formed circumferentially on a surface of the sealing liner configuring the sealing portion. In a cross section perpendicular to a groove forming direction of the groove, an angle θ, formed between a side WU of the groove on the most upstream side with respect to the flowing direction of the leakage flow and a side W0 of the groove which is on an extended line of the surface of the sealing liner, is determined to be 15° or more and 40° or less.
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